/Engine/Source/Runtime/AudioMixer/Public/AudioBusSubsystem.h
[Audio::FPatchInput](API\Runtime\SignalProcessing\DSP\FPatchInput) AddPatchInputForAudioBus ( [Audio::FAudioBusKey](API\Runtime\AudioMixer\FAudioBusKey) InAudioBusKey, int32 InFrames, int32 InChannels, float InGain )